Food workers say that they are frustrated by a wage freeze and health-care takeaways suggested by concessionaire Aramark, which handles food and beverage sales at the stadium.

"We believe that there is strength in numbers, so it is good that both unions have taken a stance," Shelton said. "We hope to send a strong message to Aramark and to the Angels that they are a successful franchise, and they need to share some of that (financial) success with their workers."

Both unions have said they don't immediately expect workers to walk off the job and are hopeful that a strike can be avoided. Both unions have been negotiating for months, since before the current season began.

Aramark officials didn't immediately return a phone call seeking comment. Angels spokesman Tim Mead said after the first strike authorization that the team remains hopeful that any strike can be averted and that, in any case, games would continue.

Shelton said that union workers are frustrated about having to pay a larger share of health-care costs, especially when they are paid less than similar workers at other ballparks and entertainment venues.

As a comparison, she said, a food-service cashier at Angel Stadium makes $12.88 an hour; at Dodger Stadium, $12.94; and at San Francisco's AT&T Park, $16.40.

The Angels just ended a nine-game homestand and aren't scheduled to return home until Sept. 2. The regular season ends Sept. 28.